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Saw phaseshifter and wavefolder
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gabbagabi



Joined: Nov 29, 2008
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PostPosted: Sun Feb 12, 2017 9:18 am    Post subject: Saw phaseshifter and wavefolder
Subject description: updated version
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Hi,
here is my try to create a Saw-Phaseshifter. it turned out that is is working as a (Sine and Tri) wavefolder also.
The basic version is for one control signal only.
The second for two control signals.
Signal and Control Voltage for Saw Phaseshifter should be 5Vpeak.
If u use a POT instead of a TRIM for the SAW-Shape, u can have more waveform variety.
The processed signal will come out in turned phase, may u apply an additional opamp to turn it back.

Just for the fun i made two animated gifs out of the simulation to see the function. (edit: seems like the gifs only working in IE)

cheers bb
gabbagabi


Gabbagabi wavefolder and SAW Phaseshifter_a.png
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Gabbagabi wavefolder and SAW Phaseshifter_a.png



Gabbagabi wavefolder and SAW Phaseshifter_b.png
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Gabbagabi SAW Phaseshifter work.gif
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Gabbagabi  SAW Phaseshifter work.gif



Gabbagabi wavefolder work.gif
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Gabbagabi wavefolder work.gif



Last edited by gabbagabi on Sun Aug 13, 2017 10:06 am; edited 1 time in total
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Blue Hell
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PostPosted: Sun Feb 12, 2017 9:39 am    Post subject: Reply with quote  Mark this post and the followings unread

the sine gif works in firefox for me - the saw shaped one not.

Not sure how this works, but the animated results look nice :-)

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also .. could someone please turn down the thermostat a bit.
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gabbagabi



Joined: Nov 29, 2008
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Location: Berlin by n8
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PostPosted: Mon Feb 13, 2017 2:20 am    Post subject: Reply with quote  Mark this post and the followings unread

ok, after testing today I had to make some changes.
It appeared that I could not reach the extremes of +/-180° phaseshift with the poti, only about 80%.
So i buffered the control voltage with an inverter, i have choosen the 1M Resistors cos 100k and below dindt worked.


I did animated GIF´s again, this time from real scopes. One shows the sawphaseshift, the other the wavefolding first half sinus second triangle. hope they work in firefox this time.

cheers bb
gabbagabi

ps: yes there are glitches, but i like them


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gabbagabi



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PostPosted: Mon Feb 13, 2017 4:37 am    Post subject: Reply with quote  Mark this post and the followings unread

and it sounds like this


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haebbmaster



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PostPosted: Tue Feb 14, 2017 12:30 pm    Post subject: Reply with quote  Mark this post and the followings unread

yeah, thank you!


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PHOBoS



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PostPosted: Tue Feb 14, 2017 2:14 pm    Post subject: Reply with quote  Mark this post and the followings unread

very nice circuits Razz
in the first ones are you taking the output from U3c ?

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gabbagabi



Joined: Nov 29, 2008
Posts: 615
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PostPosted: Wed Feb 15, 2017 6:07 am    Post subject: Reply with quote  Mark this post and the followings unread

thx!
@PHOBos yes in the first pics i was using U3C as output.




a little on how it works, as reference the first posted circuit and the pic from this post:
-at the signal input we have a saw save (or ramp)(light blue in the pic from this post)
-out of this saw/ramp wave - and a given control voltage at the modulation input -the upper opamp (U1C)
will produce a square wave 5Vpeak (green in the pic from this post)
very like a PWM circuit
- the lower opamp (U3C) is mixing these two wave together, this wouldt result in a phaseshifted saw/ramp
(second half in the pic from this post there where the math is)
- as shown this resulting wave will have an offset,
- now comes the trick: the offset is the same like the pwm-controll-voltage so we are mixing this amount
also in (over R20 in the pic from the first post), the result is a offset-free but phaseshifted saw/ramp


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elektrouwe



Joined: May 27, 2012
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PostPosted: Wed Feb 15, 2017 4:29 pm    Post subject: Reply with quote  Mark this post and the followings unread

you can do a small change to your first circuit:
if the comparator could deliver a stable and symmetric Vout, like the +-5V shown in your explanation, then there would be no need for adjustments.
This could be done e.g. by using a rail to rail output opamp/comparator for U2 (U1C in the original circuit).
Another way is adjusting the power supply for +-10.0V U2 output. This could easily be done with 2small LM317,LM337 and trimmers for each voltage. This
could be useful for a quad saw animator (string ensaemble) with 2 TL074s.

For a single saw animator it is sufficient to adjust R1 and add an offset adjustment to U3 (U3C in the original circuit) instead of an adjustable power supply. Then you don't need your more complicate 2nd and 3rd versions.


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gabbagabi



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PostPosted: Sun Aug 13, 2017 10:06 am    Post subject: Reply with quote  Mark this post and the followings unread

updated version


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